US3807536A - Shoe-drum brakes for vehicles - Google Patents

Shoe-drum brakes for vehicles Download PDF

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Publication number
US3807536A
US3807536A US00225863A US22586372A US3807536A US 3807536 A US3807536 A US 3807536A US 00225863 A US00225863 A US 00225863A US 22586372 A US22586372 A US 22586372A US 3807536 A US3807536 A US 3807536A
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US
United States
Prior art keywords
shoe
cylinder
cylinders
shoes
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00225863A
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English (en)
Inventor
C Newstead
A Wright
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Girling Ltd
Original Assignee
Girling Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Girling Ltd filed Critical Girling Ltd
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Publication of US3807536A publication Critical patent/US3807536A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes

Definitions

  • the usual actuator is a double-ended hydraulic cylinder in which work two pistons each adapted to engage an end of a shoe, fluid under pressure being fed to the space between the pistons from a pedal-operated master cylinder or other source of pressure fluid.
  • a serious disadvantage of that arrangement is that in the event of failure of a pipe line leading to the wheel cylinder, or even of a seal in the cylinder, the brake is put out of action.
  • the shoes of a shoe-drum brake are actuated by fluid under pressure supplied from two separate pressure sources to two separate single-ended hydraulic wheel cylinders which are located between the shoes with their axes substantially parallel and of which at least one is floatingly supported by the shoes.
  • Both cylinders may be floatingly supported by the shoes or one may be fixed to the back-plate of the brake.
  • the cylinders are preferably displaced in an axial direction relative to one another, the closed end of each cylinder engaging directly, or through a short axial spigot integral with the cylinder, with the web of one shoe, and the web of the other shoe being engaged by a piston-rod of substantial length projecting from the other end of the cylinder.
  • the two cylinders are preferably arranged reversely or back-to-back, the long piston-rod of one cylinder lying alongside the other cylinder so that the overall transverse dimension of the actuator formed by the two cylinders can be kept to a minimum.
  • This dimension can be reduced by making the long piston-rods of small diameter relative to the diameter of the cylinders to allow a large amount of overlap of the cylinders.
  • the cylinders can be arranged with their axes in parallel horizontal, vertical or inclined planes as required by the design of the rest of the brake.
  • the two-sources of pressure fluid may conveniently be the two pressure spaces of a tandem master cylinder so that normally fluid is fed to both wheel cylinders at the same pressure.
  • the two pressure sources may be two separate master cylinders operated simultaneously or independently.
  • Slots of substantial axial length are formed in the outer ends of the spigot and piston-rod of each cylinder to receive inwardly projecting lugs on the shoe webs, the lengths of the slots preferably being greater than the maximum permissible outward movement of the adjacent shoe end. This avoids any risk of a floating cylinder becoming disengaged from the shoes due to wear of the shoe linings.
  • FIG. 1 is an end elevation with one half in section
  • FIG. 2 is a vertical section on the line 2-2 of FlG. l;
  • F l0. 3 is a section of the actuator on the line 33 of .FIG. 1.
  • the brake illustrated is of the well-known duo-servo type.
  • Arcuate shoes 1, 2 provided with friction linings 3 are articulated together at one end by a strut 4 of which the effective length is automatically adjusted as the shoe linings wear by known mechanism indicated generally at 5. 1
  • the shoes When the brake is applied the shoes tend to be carried round with the brake drum and one or other of the shoes, according to the direction of rotation of the drum, anchors on a torque-taking pin 6 fixed in the sta tionaryback-plate 7 of the brake.
  • the shoes ean be applied mechanically for parking by a hand brake actuating a cable 8 which is brought in through an opening in the back-plate and over a rocking quadrant 9 'to a cam 10 located between the shoe ends.
  • the shoes are applied hydraulically for normal service braking by fluid under pressure supplied from separate sources to two single-endedwheel cylinders 11 and 12 floatingly supported between lugs 13, 14 pro jecting inwardly from the webs of the shoes adjacent to the ends co-operating with the pin 6.
  • the axes of the two cylinders are parallel to the back-plate.
  • each cylinder Working in each cylinder is a piston 15 sealed by a 'lip seal 16 and an O ring 17 housed in an annular grooye in the cylinder bore.
  • the piston may have an extension 18 at the end nearest the closed end of the cylinder to prevent tilting of the piston.
  • An axial spigot 19 projecting from the closed end of the cylinder 1 1 has in its free end a slot of substantial axial length which receives a portion of the mg 13 on the shoe 1 within a notch in the lug,
  • the other cylinder 12 is of identical construction but i is reversed, the spigot 21 on the closed end of that c'ylinder engaging with the lug 14 on the shoe 2 while the piston-rod 22 engages with the lug l3 on'the shoe 1
  • the piston-rod of each cylinder is in vertical alignment with the other cylinder.
  • a spring 23 may be located in each cylinder between the piston and the closed end of the cylinder to urge the cylinder and piston-rod into engagement with the lugs on the shoes.
  • Fluid under pressure is supplied from separate sources through flexible pipes connected to union sockets 24 from which passages lead to the pressure spaces in the cylinders.
  • An advantage of a floating single-ended cylinder is that it applies equal forces to the two shoes between which it is supported. If one cylinder is fixed the force and piston assemblies of which at least one is floatingly supported by the shoes, and one end of each cylinder engages the web of one shoe and the web of the other shoe is engaged by a piston-rod of substantial length projecting from the other end of the cylinder. theassemblies being reversely arranged with the piston-rod of one assembly alongside the cylinder of the other assembly and with the cylinders being constructed and arranged to radially overlap so that the overall radial dimension of the two actuators is kept to a minimum.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
US00225863A 1971-02-15 1972-02-14 Shoe-drum brakes for vehicles Expired - Lifetime US3807536A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB467871A GB1379225A (en) 1971-02-15 1971-02-15 Shoe-drum brakes for vehicles

Publications (1)

Publication Number Publication Date
US3807536A true US3807536A (en) 1974-04-30

Family

ID=9781721

Family Applications (1)

Application Number Title Priority Date Filing Date
US00225863A Expired - Lifetime US3807536A (en) 1971-02-15 1972-02-14 Shoe-drum brakes for vehicles

Country Status (5)

Country Link
US (1) US3807536A (enrdf_load_stackoverflow)
JP (1) JPS5111734B1 (enrdf_load_stackoverflow)
BR (1) BR7200854D0 (enrdf_load_stackoverflow)
DE (1) DE2207050B2 (enrdf_load_stackoverflow)
GB (1) GB1379225A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180149A (en) * 1977-04-04 1979-12-25 The Bendix Corporation Drum brake and mounting means therefor
EP0085233A1 (en) * 1982-01-05 1983-08-10 Automotive Products Public Limited Company Drum brake having automatic wear adjuster
CN1058074C (zh) * 1995-11-18 2000-11-01 沈向明 汽车双楔型制动器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS646979B2 (enrdf_load_stackoverflow) * 1979-05-08 1989-02-07 Santoru Sutefuanoa Do Rusherushu Mekaniku Hidoromekaniku E Furotsutoman

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1093228B (de) * 1955-11-30 1960-11-17 Daimler Benz Ag Anordnung der Radbremszylinder in hydraulischen Bremsbetaetigungsanlagen fuer Fahrzeuge, insbesondere Kraftfahrzeuge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180149A (en) * 1977-04-04 1979-12-25 The Bendix Corporation Drum brake and mounting means therefor
EP0085233A1 (en) * 1982-01-05 1983-08-10 Automotive Products Public Limited Company Drum brake having automatic wear adjuster
CN1058074C (zh) * 1995-11-18 2000-11-01 沈向明 汽车双楔型制动器

Also Published As

Publication number Publication date
DE2207050A1 (de) 1972-08-17
GB1379225A (en) 1975-01-02
JPS5111734B1 (enrdf_load_stackoverflow) 1976-04-13
DE2207050B2 (de) 1977-02-03
BR7200854D0 (pt) 1973-05-17

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